How can I tell if my incision is infected?

Well, I had my gallbladder removed on the 19th of this month, and 2 of my incisions came open. The one on my belly button has healed quiet nice. I mean its not fully healed but its 90% healed. The other one is on my right side under my right breast. I have been keeping it clean and made sure it was covered with a bandage. It doesn't really hurt unless I push on it. The skin close to the wound is slightly red but not bright red. The only redness on my skin is where the bandage is. There is some leakage but no puss or blood. There isn't an odor that I can smell and its not really swollen or enflamed. The only pain I experience on my right side is probably from my muscles and from the last of the gas leaving my body from the surgery but there is no pain coming from the wound itself. Anyways, I wanted to see what any of you thought. Please and thank you so much.